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Outdated Drivers Can cause hardware related Errors. Check your PC Drivers now.

Error 644

1.  Check dialer settings.  Make sure the correct number is being dialed.

2.  If you are not on a network then check your network settings.

3.  If you are on a network, contact your sysadmin.  Someone else on the network is using your messaging name and you will not receive message popups.